In October 2013, he was appointed Chairman of the Consultative Committee on Economic and Trade Co-operation between Hong Kong and the Mainland. In January 2013 he was appointed a non-official member of the Economic Development Commission, and Convenor of its Working Group on Convention and Exhibition Industries and Tourism.

He is Vice-Chairman of the Hong Kong Philharmonic Society, Chairman of Harrow International School Hong Kong, member of the Chinese People's Political Consultative Conference, Honorary Consultant to the Mayor of San Francisco, former International Business Advisor to the Mayor of Beijing, and a member of Lantau Development Advisory Committee of Hong Kong Government.

He is an independent non-executive Director of AIA Group Ltd and China Resources Power Holdings Company Ltd., and senior advisor to Credit Suisse, Greater China. So is a former independent director of HSBC and Cathay Pacific Airways Limited.

In the political aspect, So is a member of the Chinese People's Political Consultative Conference from 2008. He was an International Business Advisor to the Mayor of Beijing,[4][6] and was appointed Honorary Consultant to the Mayor of San Francisco in 2013. He was also appointed by the HKSAR Government as Chairman of the Film Development Council from April 2007 to March 2013.[4]

So's name is found among the Panama Papers, including as an owner of an offshore company Jaderich Limited and as a stock holder of Solid Foundation Limited (SFL).[8] He refused to reveal the business nature of Jarderich Ltd, when he was enquired by the local media. He only stated the company has been inactive for year.[9]